Here is a NY Times article about
Making Food Seriously Local.
Once the Times archives the article, you might need a password to log in, so I've also created a .pdf file and attached it here as well. But the pics are more fun in the link because you can make them larger.
Interesting urban ag model with lots of
permaculture aspects: public funds and donated/recycled materials used to renovate a London eyesore; lots of volunteers helped with the cleanup; businesses donated tech/growing stuff (for publicity, I assume); income model includes selling food to a
local cafe, renting the space both day and eve.
While I have concerns that such closed, engineered systems could be difficult to maintain naturally, it's still quite fascinating in terms of the support they've gained.